[network] Send RPC notification to upstream before waiting for half-close of stream
[network] Send RPC notification to upstream before waiting for half-close of stream

Closes: #2532
Approved by: phlip9

libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra